Mercury/Oval hilt SHOTO chassis

If you're wanting to put a crystal chamber in a standard length Mercury saber, you'll need one of these SHOTO chassis. They hold an 18350 battery to give you some extra space for your chamber. They still hold Proffie/CFX and GHv3/4 sound boards and a 28mm bass speaker, so all of the normal functionality is still there. You can still add the metal accent rods to them (see tutorial here) so the looks are still there.